| 释义 |
WordReference Random House Unabridged Dictionary of American English © 2024par•al•lax (par′ə laks′),USA pronunciation n. - Opticsthe apparent displacement of an observed object due to a change in the position of the observer.
- Astronomythe apparent angular displacement of a celestial body due to its being observed from the surface instead of from the center of the earth (diurnal parallax or geocentric parallax) or due to its being observed from the earth instead of from the sun (annual parallax or heliocentric parallax.) Cf. parallactic ellipse.
- Photographythe difference between the view of an object as seen through the picture-taking lens of a camera and the view as seen through a separate viewfinder.
- Opticsan apparent change in the position of cross hairs as viewed through a telescope, when the focusing is imperfect.
- Greek parállaxis change, equivalent. to parallak- (stem of parallássein to cause to alternate, equivalent. to para- para-1 + allássein to vary, akin to állos other; see else, allo-) + -sis -sis
- 1585–95;
|